Structural, physiological and biochemical responses of Pyrus calleryana offspring to salt stress

文献类型： 外文期刊

第一作者： Li, X.

作者： Li, X.;Lin, J.;Chang, Y.;Zhang, Z.;Li, X.;Wang, Z.;Wang, Q.;Chang, Y.;Dong, W.

作者机构：

关键词： elemental ions;malondialdehyde (MDA);photosynthesis;rootstock;salt damage;ultrastructure

期刊名称：EUROPEAN JOURNAL OF HORTICULTURAL SCIENCE （ 影响因子：1.482； 五年影响因子：1.503 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Pyrus calleryana is an important rootstock of pear because it has a high tolerance to salt stress; however, the mechanism of this high salt tolerance remains unclear. In this study, an assessment of salt tolerance in P. calleryana offspring was conducted, and the physiological and structural mechanisms of salt tolerance in two representative lines, one (Ps) with a sensitivity to salt stress and another (Pr) with a high resistance to salt stress. It was found that salt stress significantly reduced chlorophyll content, net photosynthetic and transpiration rate, stomatal conductance, and chlorophyll fluorescence parameters, but there were more reductions in those parameters in the Ps compared with the Pr. In contrast, electrical conductivity and the contents of malondialdehyde (MDA) and H2O2 in the Ps and Pr significantly increased after salt stress, and there was a greater increase in the three parameters in the Ps compared with the Pr. POD activity decreased in the Ps, but it increased in the Pr after salt stress. Moreover, the Ps had a greater degree of increase in Na+ concentration compared with the Pr after salt treatment, whereas there was a greater reduction in K+, Ca2+ and Mg2+ contents in the Ps leaves than in the Pr leaves. Furthermore, salt treatment caused serious damage to the leaf microstructure and ultrastructure of the Ps, while the Pr leaf structure was not severely affected by the salt treatment. The results indicate that salt tolerance in P. calleryana is determined by multiple genes, and Pr possesses a well-integrated system to alleviate salt damage.

分类号： S6

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